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85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
// Disabling building of yaml support in cases where golang is 1.0 or 1.1
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// as the encoding library is not implemented or supported.
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// +build go1.2
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package altsrc
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"os"
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"gopkg.in/urfave/cli.v1"
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"gopkg.in/yaml.v2"
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)
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type yamlSourceContext struct {
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FilePath string
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}
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// NewYamlSourceFromFile creates a new Yaml InputSourceContext from a filepath.
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func NewYamlSourceFromFile(file string) (InputSourceContext, error) {
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ysc := &yamlSourceContext{FilePath: file}
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var results map[interface{}]interface{}
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err := readCommandYaml(ysc.FilePath, &results)
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if err != nil {
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return nil, fmt.Errorf("Unable to load Yaml file '%s': inner error: \n'%v'", ysc.FilePath, err.Error())
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}
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return &MapInputSource{valueMap: results}, nil
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}
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// NewYamlSourceFromFlagFunc creates a new Yaml InputSourceContext from a provided flag name and source context.
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func NewYamlSourceFromFlagFunc(flagFileName string) func(context *cli.Context) (InputSourceContext, error) {
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return func(context *cli.Context) (InputSourceContext, error) {
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filePath := context.String(flagFileName)
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return NewYamlSourceFromFile(filePath)
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}
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}
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func readCommandYaml(filePath string, container interface{}) (err error) {
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b, err := loadDataFrom(filePath)
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if err != nil {
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return err
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}
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err = yaml.Unmarshal(b, container)
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if err != nil {
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return err
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}
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err = nil
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return
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}
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func loadDataFrom(filePath string) ([]byte, error) {
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u, err := url.Parse(filePath)
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if err != nil {
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return nil, err
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}
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if u.Host != "" { // i have a host, now do i support the scheme?
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switch u.Scheme {
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case "http", "https":
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res, err := http.Get(filePath)
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if err != nil {
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return nil, err
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}
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return ioutil.ReadAll(res.Body)
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default:
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return nil, fmt.Errorf("scheme of %s is unsupported", filePath)
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}
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} else if u.Path != "" { // i dont have a host, but I have a path. I am a local file.
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if _, notFoundFileErr := os.Stat(filePath); notFoundFileErr != nil {
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return nil, fmt.Errorf("Cannot read from file: '%s' because it does not exist.", filePath)
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}
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return ioutil.ReadFile(filePath)
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} else {
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return nil, fmt.Errorf("unable to determine how to load from path %s", filePath)
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}
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}
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